Someone correct me if I'm wrong, but I don't think 30-40 is really an issue. You can Flop, Pitch or use Full, just account for the full lie with Flop and Pitch, not sure about Full.
40-50 and 50-60 though I think gets trickier. I had a 40-50 last night and tried the Flop and barely got out of the trap, there were possibly other factors at play though like the wall of the trap being quite high which is probably why I landed just on the top of it.
I also had a 50-60 last night and I Punched it out with success accounting for Full lie, I did not want to chance a Flop or Pitch in that one.
I try not to hit any sands shots less than 75% power as well, that is a recipe for disaster no matter which shot you use which is why I hardly ever get to use Full as a choice (with closer traps).